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DOI10.1175/JCLI-D-17-0558.1
Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring
Li, Zhenning1; Yang, Song1,2,3; Hu, Xiaoming1,2; Dong, Wenjie1,4; He, Bian5
2018-05-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2018
卷号31期号:10页码:3755-3763
文章类型Article
语种英语
国家Peoples R China
英文摘要

In this study, El Nino events are classified as long El Nino (LE) events and short El Nino (SE) events based on their durations, and the characteristics of the early stages of these events are investigated. Results indicate that LE events tend to start earlier compared to SE events, initiating in boreal spring and peaking in winter. Their early occurrence is attributed to the western equatorial Pacific (WEP) sea surface wind anomalies that benefit the eastward propagation of warm water by forcing the downwelling Kelvin waves. It is also found that the wind anomalies are potentially induced by the convection anomalies over the WEP in spring. Experiments with a fully coupled climate model forced by convection heating anomalies over the WEP show that El Nino events become stronger and longer after introducing anomalous convection heating. The convection anomalies induce an extensive anomalous westerly belt over the WEP, which charges El Nino by eastward-propagating Kelvin waves. Moreover, induced by the anomalously northward-shifted ITCZ heating and the suppressed heating over the Maritime Continent, the equatorially asymmetric westerly belt reduces the meridional shear of mean easterly wind in the lower latitudes, which maintains an anomalous equatorward Sverdrup transport and in turn prolongs the persistence of El Nino events. A case study of the 2015/16 super El Nino and a regression study by using a rainfall index in critical regions support the above results.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000430539700003
WOS关键词TROPICAL PACIFIC ; INDIAN-OCEAN ; ANNUAL CYCLE ; GLOBAL PRECIPITATION ; COLD-TONGUE ; ENSO ; MONSOON ; SYSTEM ; MODEL ; ONSET
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/19742
专题气候变化
作者单位1.Sun Yat Sen Univ, Sch Atmospher Sci, Guangzhou, Guangdong, Peoples R China;
2.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou, Guangdong, Peoples R China;
3.Sun Yat Sen Univ, Inst Earth Climate & Environm Syst, Guangzhou, Guangdong, Peoples R China;
4.Sun Yat Sen Univ, Guangdong Hong Kong & Macao Joint Lab Trop Oceani, Guangzhou, Guangdong, Peoples R China;
5.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing, Peoples R China
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GB/T 7714
Li, Zhenning,Yang, Song,Hu, Xiaoming,et al. Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring[J]. JOURNAL OF CLIMATE,2018,31(10):3755-3763.
APA Li, Zhenning,Yang, Song,Hu, Xiaoming,Dong, Wenjie,&He, Bian.(2018).Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring.JOURNAL OF CLIMATE,31(10),3755-3763.
MLA Li, Zhenning,et al."Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring".JOURNAL OF CLIMATE 31.10(2018):3755-3763.
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